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638 Moira (A917 RC)
Classification: Main-belt Asteroid          SPK-ID: 2000638
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 84 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1591645187510731 3.3294e-08  
a 2.734888127109668 5.2084e-09 au
q 2.299590974520235 9.1403e-08 au
i 7.713452644771107 3.0741e-06 deg
node 103.1898009347831 2.5202e-05 deg
peri 128.9523522078463 2.6849e-05 deg
M 359.3942763853471 9.103e-06 deg
tp 2459003.279583853520
(2020-Jun-02.77958385)
4.1776e-05 TDB
period 1651.991375374472
4.52
4.7191e-06
1.292e-08
d
yr
n .2179188132373847 6.2251e-10 deg/d
Q 3.170185279699102 6.0374e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3437  
   data-arc span      41899 days (114.71 yr)  
   first obs. used      1906-01-24  
   last obs. used      2020-10-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42562  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:27:27  

Additional Information
 Earth MOID = 1.29752 au 
 Jupiter MOID = 1.86345 au 
 T_jup = 3.321 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455574.5 (2011-Jan-13.0) TDB
Reference: JPL 84 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1622687073726346 3.3393e-08  
q 2.290366502409596 9.2034e-08 au
tp 2455697.340341782931
(2011-May-15.84034178)
3.7399e-05 TDB
node 103.246798715307 2.5193e-05 deg
peri 128.6038260669786 2.6757e-05 deg
i 7.716912173238621 3.0791e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3437  
   data-arc span      41899 days (114.71 yr)  
   first obs. used      1906-01-24  
   last obs. used      2020-10-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42562  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:27:27  

Additional Information
 Jupiter MOID = 1.86345 au 
 T_jup = 3.321 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.115122364233159E-15 -3.069819080512454E-15 3.695049304762354E-14 -1.198257719890197E-14 3.057714918144098E-14 -3.146871895055391E-15
q -3.069819080512454E-15 8.470170285129033E-15 -7.058340938566598E-14 3.330345059735206E-14 -7.859757817784484E-14 8.755284269275893E-15
tp 3.695049304762354E-14 -7.058340938566598E-14 1.398685486924202E-9 -5.234724377878614E-13 3.509316030894384E-10 -5.747339921892424E-14
node -1.198257719890197E-14 3.330345059735206E-14 -5.234724377878614E-13 6.346668461335884E-10 -6.288274610606294E-10 -2.805600079043041E-11
peri 3.057714918144098E-14 -7.859757817784484E-14 3.509316030894384E-10 -6.288274610606294E-10 7.159595427560963E-10 2.776574424687853E-11
i -3.146871895055391E-15 8.755284269275893E-15 -5.747339921892424E-14 -2.805600079043041E-11 2.776574424687853E-11 9.480968723047765E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.0   n/a MPO279519  
diameter diameter 59.594 km 0.387 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.8768 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.060   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

638 Moira (A917 RC)          Discovered 1907-May-05 by Metcalf, J. H. at Taunton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A917 RC = 1944 QJ = 1976 WA1 = A893 EB = A906 BF = A907 JG 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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